Triple valve.



v PATENTEDOGTi 23, 1906. D. INCHES n E. J. 'HOSKEIL TRIPLEl VALVE.APPLIOATION FILED JUNE Q8, 1906.',

. 4W/TNESSES.-

Mgr.

2O possibilityv ofan emergency 'application oc- `36 y `valve would onlyprevent 'theserviceapplin g f STATES y l' To dllilihomiitnmy concern: f

`PATENT oFFIoE I j DAVID]INCHES,v 'or vNORTH BEND, AND EDWARD J.HosKERfor s 'QIZrAMLooPs BRITISH lCOLUMBIA, CANADA.

" TRIPLE VALVE. y

Beit known that we,1DAvID lNoHEs'residfing at 'the towny of North Bend,and EDWARD J.,HosxER, residingat the cityof Kamloops.;

in the Province of British -Columbia, Canada,

. citizens of the'Dominion of Canada, have in-` l vented anew and usefulImprovementin specification. IO

TripleValvesfofQwhichthe `'following is a This invention relates toanirnprovement VVin they triple-valve which in yan air-brake systems'uchas .the'.Westinghouse orHNew Yor operatesto"admitv the compressed airfromthe vauxiliary reservoir to the brakecylinder, Awhich triple valveis actuated for either a l. service or an f' emergency application by aslightor greater-reduction of the pressure in thetrain line-pipe,7aseither one stop or the other is required. v

This invention-fis designed to remove the I curri-ng when the pressurevof the train-pipe is y onlyreduced slightlyfora service application.V'I`his-fai1lt'is caused by undue friction ofthe triple-valvev piston`orits connected parts on" any particular vehicle, caused by'gummy oilorf dirt,-Which 'will hold the piston and prevent vit responding freelyto theslight service reduction of pressure requisite to operate it. lIfthis undue friction in any particular triple cation jof lpressure .beingadmittedv to the brake-'cylinder of its'own vehicle, theobjec- D `tionawould-`not be-veryserious. .Owin ,how-

long been experiencedand aremedyfor which Vehicle, but von al everto'the'unc'ertainty of the frictiona resistance ofa dirty triplevalvethe piston may be y has been carefully sought for. We propose toovercome it byprovid'ing a means by which when any trip e-valve pistonfails to respond to a slight'reduction of pressure in the trainline-'pipe .the air rfrom the vauxiliary-reservoir 'sideofthe pistonwill pass to the y.train-line Y side; "In lother Words, if a triplevalve will Vnot respondtoaslight or service reduction` `VSpk-Icicationof Letters Patent.

clean and in good working order. y prov1s1on 1f from anyfreason, suchasgummy Patented Oct. 23, 1906.

of'pressure wel proposeto deprive it duringl that particular reductionof the means for operating at' all in a service-stop, while its fullpower is stillavailable for an emergencystop when necessary. i

The essential feature of this invention, therefore, lies in providing ameans for passing air under-a certain measure o f control, which Will beex lained, from the auxiliaryreservoir side o the triple iston to thetrain-line-pipe side when such piston does not respond to a servicereduction or pressure in the train line-pipe. The manner in which f wepropose to eii'ect this purpose Vis fully set forth in the followingspecification, reference being made to the drawings, by which itisaccompanied, `in which- Figure I is a, longitudinal sectionthrogh a Ipiston in the normal or feed position and in dot-and-dash lines itsposition during a'serv- 4triple-valve body, showing. in full lines the fice-stop. Fig. 2 is a similar view showing' the positionfof the pistonduring an'ernergency-stop, and Fig. 3 a cross-section through theoutlet-port on the line A. w

In the drawings, 2 represents the bodyy of' the triplevalve, 3 thetriple-valve piston,

and 4 its ring, 6 being the train-line side of the piston, and 5 theauxiliar -reservoir side. A passage 10, shown in t e drawings forconvenience ofl illustration as a pipe, leads from a convenient positionon the auxiliaryreservoir side 5 of the triple-valve piston and deliversthrough a narrow circumferentiallyelongated port 11 in the bushing ofthe triple-valve c linder on the train-line side of its iston 3 W enthis piston is in the normal or eed position.

' The passage 10 is furnished with a checkl valve 12,y openin toward thetrain-line-pipe Sider-which cheri-valve is spring-loaded to an amountslightly in excess of the maximum pressure necessary to lcause armovement of the Vtriple-valve piston when such is With this oil ordirt, the piston of a particular triple the brake-cylinder will passthrough the pa's- *l sage 10 vto vthe train-line sideof the piston 3 andpreclude the possibility of suchVA excess pressure operating the pistonduring the stop and possibly causing the piston to overrun the limit fora service-stop and operate its own and consequently other triple valvesfor an emergency-stop.

In order to avoid air passing through the passage when the triple pistonis Working properly and responds freely, the location of the port 11 andits Width are such that it Will be covered by the ring 4 of the piston 3when the piston end 7 first contacts With the end 8 of thegraduating-stein, but that on further movement of the piston to compressthe graduating-stem spring 9, as in an emergency-stop, the piston Willpass the port 11, and as both inlet and outlet of the passage 1() Willthen be on the auxiliary-reservoir side of the piston no air Will beable to pass through it from the auxiliary reservoir to the trainline'side of the piston 3. It is further desirable that the port 11 Will beuncovered to the train-line side of the piston when the piston 3, as ina service-stop, moves back off the end of the graduating-stem 7 to closethe graduating-valve of the triple valve slide 13. This is necessary toinsure that if the piston of a dirty triple valveWhich may haveresponded to a first reduction of pressure for a servicestop refuses torespond to a further reduction the excess of pressure Which Wouldoperate a triple valve in goed order Will pass through the port 11 tothe train-line side of the piston 3 and avoid the possibility of thepiston being suddenly released and setting the brakes for anemergency-stop. In applying the invention to the existing Westinghousetriple valve the port 11 cannot be exactly located as described, becauseof the limited Width of the piston-ring, and in such application of theinvention the port is, strictly speaking, located approximately half-Wayin the travel of the piston-ring 3 from its position when the piston end7 is in first contact with the end 8 of the graduating-stem and theposition of said ring when the graduating-valve of the slide 13 isclosed an'd before the slide-valve itself is moved. It Will be apparentthat this passage 10vand the control of its outlet or inlet by themovement of the triple-valve piston is the essential feature of thisinvention.

'In the operation of the device, when a service-stop is .to be made andthe triple valve piston moves freely a sufficient amount to admit air tothe brake-cylinder through the graduating-valve of the slide-valve 13 ofthe triple air cannot pass through the passage 10, as such passageisclosed against such slight reduction by the pressure of the spring whichmaintains the check-valve l2 on its seat; but if the triple valve isdirty and the piston of it is held back by the undue friction caused bythe presence of such dirt any excess of air-pressure over What isnecessary to move a piston in good Working order will press open thecheck-valve 12 and the air Will pass through the passage 10 from theauxiliary-reservoir side to the train-line side of the piston 3 and Willprevent that excess of air-pressure acting on the piston 3, as it mightdo, to cause an emergency-stop if the gummy oil or dirt which held thepiston hack in the first instance should release it later; but althoughWe propose to thus automatically deprive a dirty or gummed-up tripleIvalve of the means to do harm, in causing an emergency-stop when such isnot required, if such stop is necessary the sudden and extreme reductionof pressure required to ell'ect such will move the piston 3 to the fulllimit necessary to operate the emergency-valve, and in that movement thepiston-ring 4 will pass the port 11 in the triple-valve cylinder, sothat both ports of the passage 1() are on the auxiliary-reservoir sideof the triple piston and the passage 10 can have no effect.

lith this invention not only is a means provided to prevent a dirtytriple valve from disarranging a service application of the brake on thewhole train, but it will by the non-application of the brake on thatvehicle enable the defective triple to be located, and, if considereddesirable, it can at ence be cleaned before proceeding.

It will be obvious that the particular device illustrated necessitatesno alteration or modification of the essential principles of action ofthe triple valve, but is merely a supplementary provision that whenthrough the presence of dirt or gummy oil a triple-valve piston does notrespond readily to the reduction of air in the train line-pipe thatshould operate such piston to ellect a servicestop Will enable theexcess of air on. the rcservoir side of the piston to pass to thetrain.- line side of the same and obviate the possibility of that excessoperating the piston during the service-stop to set an emergencyapplication.

We are aware that prior to our invention provision has been made intriple valves to admit air past the piston which operates theslide-valve, but such is only when that piston is in the position ofrelease or feed, and is closed as soon as the piston has moved farenough to o Jen the graduating-valve of the slide and be ore it movesthe slide itself.

What we therefore claim as new, and desire to be protected in by LettersPatent, is-

1. ln a triple valve of the class described; a passage through which airmay pass from the auxiliary -reservoir side of the triplevalve pistonwhen such is in the normal or feed position to the train-line side ofthe same, and means for closing such passage by any movement of thetriple-valve piston that would move the sli (le-valve thereof.

2. In a triple valve of the class described; an air-passage from theauxiliary-reservoir side of the triple-valve piston when such is in thenormal or feed position to the train-line IOC IIC

side of thesame, said passage terminating in a port in the triplecylinder the location of which is such that it Will be closed by thering of the piston When such piston is in first contact with theadjacent end ofthe graduatingstem and that Will be open to thetrain-line side of the piston when the piston moves back to close theslide.

3. In a triple valve of the class described an air-passage from theauxiliary-reservoir side of the triple-valve piston When such is in thenormal or feed position, to the train-line side of the same, suchpassage terminating graduating-valve of the on thetrain-line side in aport in the Wall oi the triple cylinder, the location of which port issuch that it Will be closed by the ring of the piston against passage ofair Jfrom the train-line side of the graduating-stem, and that will beuncovered toward that side when the piston moves back the amountnecessary to close the graduating-valve of the triple slide..

4. In a triple valve of the class described;

an air-passage from the` auxiliary-reservoir side of the triple-valvepiston When such piston is in the normal or feed position to thetrain-line side of the same, the outlet of such passage on thetrain-line side being such in -location and Width that it Will be closedby the ring of the piston when such piston is in irst contact with theadjacent end of the graduating-stem but will be open to thetrainlineside of the piston when the piston has moved backv off thegraduating-stem a suffiauxiliary-reservoir side of the piston to thetrain-line side until a predetermined differ ence of pressure has beenattained.

5. In a triple valve of the class described; an air-passage from theauxiliary-reservoir side of' the triple-valve piston When such is in thenormal or feed position to the train-line side of the same, the outletof Which passage on the train-line side of the piston is so located thatit Will be closed When the piston is in irst contact with thegraduating-stem, but lopened to the auxiliary-reservoir side of thepiston Withany further movement that Would compress thegraduating-spring, a

.check-valve in such passage that'will prevent the passage of airtherethrough from the train-line side to the auxiliary-reservoir sideofthe piston, and means for leading such check-valve that it will notopen until a pressure exists on the auxiliary-reservoir side of thepiston slightly over What is required to -operate the triple-valvepiston and its slide when such are in good Working condition.

6. In a triple valve of the class described, a conduit through which airmay ass from the auxiliary-reservoir side of t e triplevalve piston Whenthe same is in one position to the train-line side of the piston, andmeans for controlling the passage of air through said conduit to thetrain-line side of the pistonas the piston moves vto move theslide-valve thereof substantially as shown and described.

In testimony whereof wehave signed our names to this speciiication inthe presence of tWo subscribing Witnesses.

DAVID INCHES. EDWARD J. I-IOSKER. Witnesses:

EDWARD RESTALL,

' J. H. ABBOTT.

